All sharks can smell blood from as much as one mile away. Only one shark can stay still without dying. Sharks skins are actually like razors, on one side they are smooth and on the other side is razor sharp. Only the bull shark can stay in fresh water. The area with more sharks is in Australia. Most shark attacks are caused by humans. It is so rare to get bitten you have a better chance of getting struck by lightning! Therer you go.